how to create an async client use python

[HaoLiuHust]

I want to create an async client with python, how could I do it, I can not find any example about it

[mehrdada]

The response-streaming calls are inherently asynchronous in Python, so the routeguide example should demonstrate the overall mechanics of it.

To make a response-unary call asynchronous, instead of making the call like: response = stub.SayHello(...), you can call the future method of the callable:

call_future = stub.SayHello.future(...)
call_future.add_done_callback(function_to_be_called_when_response_is_received)

for example, the adaptation of the helloworld example would be like:

from __future__ import print_function

import grpc
import time

import helloworld_pb2
import helloworld_pb2_grpc


def run():
  def process_response(call_future):
    print(call_future.result())

  channel = grpc.insecure_channel('localhost:50051')
  stub = helloworld_pb2_grpc.GreeterStub(channel)
  call_future = stub.SayHello.future(helloworld_pb2.HelloRequest(name='you'))
  call_future.add_done_callback(process_response)


if __name__ == '__main__':
    run()
    # do not shutdown the main thread to give a chance for async callbacks to 
    # receive their reponses.
    while True:
        time.sleep(100000)

[bhagatyj]

How does the server code implemented for this example ? Would be helpful if an example of that is posted as well.